Improvement in wood-screws



o. n. BARRETT. l

y Wood Screws. f No". 143,217, PatentedhSeptemberBO,183,

hyanan UNITED STATES PATENT OFFICEc OLIVER D. BARRETT, OF WASHINGTON, DISTRICT OF COLUMBIA.

IMPROVEMENT IN woon-scRs-ws.

Specication forming part of Letters Patent No. 143,217, dated September 30, 1873; application filed September 5, 1873.

To all whom it may concern:

Be it known that I, OLIVER 'D. BARRETT, of Washington city, in the District of Columbia, have invented certain Improvements in VWood-Screws, of which the following is a specification:

The object of my inventionris to make such a point on the screw as will render it capable of being driven into any kind of wood-hard or soft- With an ordinary screwdriver Without the necessity of first making a hole for the same with a bit or other instrument. My invention consists Vin making the ordinary woodscrew with a drill-point-V-shaped and beveled like the points of drills used by Workers of iron and brass. The distance from the drill-point to the commencement of the thread Attest:

T. T. CRITTENDEN,

GEO. W. GrsT. 

